solos: Check for rogue received packets

Sometimes there can be received packets with the size field set to 0xFFFF.
This seems to only occur after an FPGA or firmware upgrade.
This patch discards packets with an invalid size.

Signed-off-by: Nathan Williams <nathan@traverse.com.au>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/atm/solos-pci.c b/drivers/atm/solos-pci.c
index bfef8d2..6c82834 100644 (file)
--- a/drivers/atm/solos-pci.c
+++ b/drivers/atm/solos-pci.c
@@ -671,6 +671,10 @@ void solos_bh(unsigned long card_arg)
                                memcpy_fromio(header, RX_BUF(card, port), sizeof(*header));
 
                                size = le16_to_cpu(header->size);
+                               if (size > (card->buffer_size - sizeof(*header))){
+                                       dev_warn(&card->dev->dev, "Invalid buffer size\n");
+                                       continue;
+                               }
 
                                skb = alloc_skb(size + 1, GFP_ATOMIC);
                                if (!skb) {